Sorry, I just saw your reply. It got buried.

An introduction post is made the same you've been doing, just use the #introduceyourself tag (along with others that apply for you). Just write about who you are, probably that your coming over from medium, how you heard about steemit, maybe what topics you plan to write on... Really up to you in what you feel like sharing ( or not). These are the posts we watch for new people here. It should get you a nice boost :-)